ARCTIC Of Mice and Ice in the Late Pliocene of North America
ABSTRACT. Between 2.5 to 1.8 million years ago changes in arctic climate and in meadow mouse dispersal routes correlate with part of the history of uplift and glacial erosion of the Chugach and Saint Elias mountains in Alaska and adjacent Canada. Earlier meadow mice dispersing from Asia to central N...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.499.94 2023-05-15T14:19:43+02:00 ARCTIC Of Mice and Ice in the Late Pliocene of North America Charles A. Repenning The Pennsylvania State University CiteSeerX Archives 1990 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.499.94 http://pubs.aina.ucalgary.ca/arctic/Arctic43-4-314.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.499.94 http://pubs.aina.ucalgary.ca/arctic/Arctic43-4-314.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pubs.aina.ucalgary.ca/arctic/Arctic43-4-314.pdf Key words Arctic Pliocene-Pleis text 1990 ftciteseerx 2016-01-08T08:59:34Z ABSTRACT. Between 2.5 to 1.8 million years ago changes in arctic climate and in meadow mouse dispersal routes correlate with part of the history of uplift and glacial erosion of the Chugach and Saint Elias mountains in Alaska and adjacent Canada. Earlier meadow mice dispersing from Asia to central North America followed a southward coastal route between these mountains and the Pacific Ocean, appearing first in the United States Pacific Northwest. Two and a half million years ago, accelerated uplift of the Chugach and Saint Elias mountains milked Pacific westerly winds, enlarging the ice fields in these mountains so that they then flowed to the sea. This blocked the coastal dispersal for 600 O00 years, when no new immigrant meadow mice appeared in the conterminous United States. The uplift also restrained westerly winds that crossed Canada, permitting moister air from the subtropical Atlantic and from an unfrozen Arctic Ocean to produce significant continental glaciation, centered in eastern Canada. By 2.0 million years ago, glacial erosion had lowered these mountains again, letting relatively dry Pacific westerlies extend across Canada, reducing the encroachment of moist Atlantic and arctic air, and ending continental glaciation to the east. The simultaneous reduction of glacial activity in the cordillera allowed meadow mice to renew southward dispersal. Additionally, the lowered mountains remained a rain shadow, causing grassland in the Great Plains of Canada. Thus a new dispersal route to the United States was opened for grazing meadow mice and for the first time their earliest records were in the Great Plains. Loss of the continental ice sheet and an unfrozen Arctic Ocean facilitated the northward spread of warm and moist air from the North Atlantic subtropical high; it flowed northward up the eastern front of the Rocky Mountains in the United States and, mingling with the dry Text Arctic Arctic Arctic Ocean Ice Sheet North Atlantic Alaska Unknown Arctic Arctic Ocean Canada Pacific |
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English |
topic |
Key words Arctic Pliocene-Pleis |
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Key words Arctic Pliocene-Pleis Charles A. Repenning ARCTIC Of Mice and Ice in the Late Pliocene of North America |
topic_facet |
Key words Arctic Pliocene-Pleis |
description |
ABSTRACT. Between 2.5 to 1.8 million years ago changes in arctic climate and in meadow mouse dispersal routes correlate with part of the history of uplift and glacial erosion of the Chugach and Saint Elias mountains in Alaska and adjacent Canada. Earlier meadow mice dispersing from Asia to central North America followed a southward coastal route between these mountains and the Pacific Ocean, appearing first in the United States Pacific Northwest. Two and a half million years ago, accelerated uplift of the Chugach and Saint Elias mountains milked Pacific westerly winds, enlarging the ice fields in these mountains so that they then flowed to the sea. This blocked the coastal dispersal for 600 O00 years, when no new immigrant meadow mice appeared in the conterminous United States. The uplift also restrained westerly winds that crossed Canada, permitting moister air from the subtropical Atlantic and from an unfrozen Arctic Ocean to produce significant continental glaciation, centered in eastern Canada. By 2.0 million years ago, glacial erosion had lowered these mountains again, letting relatively dry Pacific westerlies extend across Canada, reducing the encroachment of moist Atlantic and arctic air, and ending continental glaciation to the east. The simultaneous reduction of glacial activity in the cordillera allowed meadow mice to renew southward dispersal. Additionally, the lowered mountains remained a rain shadow, causing grassland in the Great Plains of Canada. Thus a new dispersal route to the United States was opened for grazing meadow mice and for the first time their earliest records were in the Great Plains. Loss of the continental ice sheet and an unfrozen Arctic Ocean facilitated the northward spread of warm and moist air from the North Atlantic subtropical high; it flowed northward up the eastern front of the Rocky Mountains in the United States and, mingling with the dry |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Charles A. Repenning |
author_facet |
Charles A. Repenning |
author_sort |
Charles A. Repenning |
title |
ARCTIC Of Mice and Ice in the Late Pliocene of North America |
title_short |
ARCTIC Of Mice and Ice in the Late Pliocene of North America |
title_full |
ARCTIC Of Mice and Ice in the Late Pliocene of North America |
title_fullStr |
ARCTIC Of Mice and Ice in the Late Pliocene of North America |
title_full_unstemmed |
ARCTIC Of Mice and Ice in the Late Pliocene of North America |
title_sort |
arctic of mice and ice in the late pliocene of north america |
publishDate |
1990 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.499.94 http://pubs.aina.ucalgary.ca/arctic/Arctic43-4-314.pdf |
geographic |
Arctic Arctic Ocean Canada Pacific |
geographic_facet |
Arctic Arctic Ocean Canada Pacific |
genre |
Arctic Arctic Arctic Ocean Ice Sheet North Atlantic Alaska |
genre_facet |
Arctic Arctic Arctic Ocean Ice Sheet North Atlantic Alaska |
op_source |
http://pubs.aina.ucalgary.ca/arctic/Arctic43-4-314.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.499.94 http://pubs.aina.ucalgary.ca/arctic/Arctic43-4-314.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766291471128854528 |